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Earnings Per Share (Antidilutive Shares) (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.6 1.0 0.8 3.7